This caterpillar like creature is the larva of a sawfly, probably of the genus Dolerus. Its mother will have used her saw-like ovipositor to cut a slit in the horsetail in which to lay eggs. Once hatched, the larva is perfectly formed for chowing down horsetail fronds, while remaining largely unnoticed.
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| Dolerus Spp. - Horsetail Sawfly |
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